<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>dom</title>
	</head>
	<body>
		<ul>
			<li>1</li>
			<li>2</li>
			<li>3</li>
		</ul>
		<script>
			let div = document.createElement('div')
			let str = ''
			for (let key in div) {
				str = str + key + '__'
			}
			console.log(str)
		</script>
	</body>
</html>
